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Service de Néphrologie
Pédiatrique,
Hôpital Armand-Trousseau, Assistance
Publique-Hôpitaux de Paris, Paris,
France
Laboratoire de Biologie
Intégrée des
Cellules Rénales, Centre National de la
Recherche Scientifique Unité de Recherche
Associée 1859, Service de Biologie Cellulaire,
Commissariat à l'Energie Atomique, Saclay,
France.
Correspondence to Dr. Georges Deschênes, URA 1859, Bâtiment 520, Centre d'Etudes de Saclay, 91191 Gif sur Yvette Cedex, France. Phone: +33 1 69 08 34 08; Fax: +33 1 69 08 35 70; E-mail: deschenes{at}ferre.cea.saclay.fr
Abstract. In puromycin aminonucleoside (PAN)-treated nephrotic rats, sodium retention is associated with increased Na+/K+-ATPase activity in the cortical collecting ducts (CCD). This study was undertaken to determine whether stimulation of Na+/K+-ATPase in the CCD is a feature of other experimental nephrotic syndromes, whether it might be responsible for renal sodium retention, and whether it is mediated by increased plasma vasopressin levels or activation of calcineurin. For this purpose, the time courses of urinary excretion of sodium and protein, sodium balance, ascites, and Na+/K+-ATPase activities in microdissected CCD were studied in rats with PAN or adriamycin nephrosis or HgCl2 nephropathy. The role of vasopressin and calcineurin in PAN nephrosis were evaluated by measuring these parameters in Brattleboro rats and in rats treated with cyclosporin or tacrolimus. Despite different patterns of changes in urinary sodium and protein excretion in the three nephrotic syndrome models, there was a linear relationship between CCD Na+/K+-ATPase activities and sodium excretion in all three cases. The results also indicated that there was no correlation between proteinuria and sodium retention, but ascites was present only when proteinuria was associated with marked reduction of sodium excretion. Finally, the lack of vasopressin in Brattleboro rats or the inhibition of calcineurin by administration of either cyclosporin or tacrolimus did not prevent development of the nephrotic syndrome in PAN-treated rats or stimulation of CCD Na+/K+-ATPase. It is concluded that stimulation of Na+/K+-ATPase in the CCD of nephrotic rats might be responsible for sodium retention and that this phenomenon is independent of proteinuria and vasopressin and calcineurin activities.
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